Geon-Tae Park, Myoung-Chan Kim, Min-Su Kim, Tae-Chong Noh, Ji-Hyun Ryu, Nam-Yung Park, Yang-Kook Sun
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引用次数: 0
Abstract
To advance the sustainable development of Li-ion batteries, reducing the Co content in Li[NixCoy(Mn or Al)(1–x–y)]O2 has become essential, prompting the exploration of Co-free Li[NixMn(1–x)]O2 alternatives. Among the promising solutions are Co-free layered cathodes with compositional concentration gradients, which offer significant potential. However, their unique microstructure and compositional partitioning, key to their performance, are highly sensitive to synthesis temperatures. Over-sintering can lead to the structural unpredictability of Co-free cathode materials and detrimental effects on electrochemical properties. In this study, a highly stable Co-free layered oxide cathode is developed by doping a concentration gradient Li[Ni0.9Mn0.1]O2, with high-valence ions. This innovative strategy significantly reduces sensitivity to calcination temperatures, minimizing nano- and microstructural changes across a broad temperature range (750–810 °C). The particle-level compositional gradation and grain-level heteroelement encapsulation contribute to the cathode material's exceptional electrochemical performance. Mo doping, in trace amounts, plays a pivotal role in maintaining the stability of Co-free cathodes, enabling the development of high-potential (4.3 V vs graphite) Co-free cathodes suitable for practical and sustainable Li-ion battery applications.
为了推进锂离子电池的可持续发展,降低Li[NixCoy(Mn或Al)(1-x - y)]O2中的Co含量已成为必不可少的,促使人们探索无Co的Li[NixMn(1-x)]O2替代品。有前途的解决方案是具有成分浓度梯度的无钴层状阴极,它提供了巨大的潜力。然而,它们独特的微观结构和组成分配对合成温度高度敏感,这是它们性能的关键。过度烧结会导致无钴正极材料结构的不可预测性和对电化学性能的不利影响。在本研究中,通过掺杂浓度梯度Li[Ni0.9Mn0.1]O2,制备了一种具有高稳定性的无co层状氧化物阴极。这一创新策略显著降低了对煅烧温度的敏感性,在广泛的温度范围内(750-810°C)最大限度地减少了纳米和微观结构的变化。颗粒级的成分级配和颗粒级的异质元素包封是阴极材料优异的电化学性能的重要因素。微量Mo掺杂在保持无co阴极的稳定性方面发挥着关键作用,使高电位(4.3 V vs石墨)无co阴极适合实际和可持续的锂离子电池应用。
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.